.clearfix {
  /* 兼容IE低版本的hack写法 */
  zoom: 1;
}
.clearfix::before {
  content: "";
  display: table;
}

.clearfix::after {
  /* 必写 */
  content: "";
  /* display: block; */
  display: table;
  clear: both;
  visibility: hidden;
  height: 0;
  line-height: 0;
}
